Notes p



(No Model.)

N. P. PALMER.

TELEPHONE. v f I No. 353.755. v Patented Dec. 7, 1886.

LINE

4 E H N L LEI WITNESSES INVENTIJR n ff 014/, flax/W N PETERS, Pmmumo m nm. Waihlng'icn. n c.

UNITED STATES PATENT ()FFICE.

NOYES r. PALMER, or JAMAIoA, NEW YORK.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No.353,'755, dated December '7, 1886.

Serial No. 196,753. (No model.)

To all whom it may concern.-

Be it known that I, NoYEs F. PALMER, of Jamaica, Queens county, State of New York, have invented a new and Improved Telephone, of which the following specification is a full, clear. and exact description.

This invention relates to an improved telephone t-ransmitter or receiver combined for articulate speech or other sounds.

The invention consists in the combination of a telephone-transmitter with a spring-arm that carries a bar which is located between the diaphragm and the magnet, and which is provided with two springs carrying the electrodes.

The invention also consists in the various features ofimprovement hereinafter more fully pointed out.

In the accompanying drawings, Figure 1 is a cross-section of a telephone provided with my improvement. Fig. 2 is a top view of the electrode, and Fig. 3 a section on line 00 m, Fig. 2.

Upon one pole of a magnet is mounted a spring-arm, A, extending over the opposite pole, so that it can be attracted by such opposite pole. To this arm A is attached a socket or extension bar, L, with screws a a This bar has an upward extension, Z attached to the diaphragm D by screw (1. An extension, L, on the lower end of bar L, is provided with an adj usting-screw, Z, by which it is connected to a bracket, L", the latter being suitably fastened to the case or frame. The rigidity of the bar L and diaphragm D by this improved method produces the most sensitive effects. This bar L is also provided with a slotted shoulder-piece, Z to which are secured the ends of the electrode-springs, insulated from each other.

Into the slot of the shoulder Z is placed an insulating substance, I, having a cavity, into which is placed the .lower springarm, s of electrode E Over arm 8" is placed insulating materials 10 and u, the latter of a wedge shape. Across the upper part of the shoulder 1 extends, through opposite apertures, a pin, 1), having a split shank. Around this split shank is placed the bent end of the upper spring-arm, s, of electrode E. Thus this arm is securely bound in such manner as to permit its adjustment by turning the split pin 1) to any desired pressure. The coil or tension to spring-arm s can be so shaped by several turns, before placing in the split pin p, that the pressure can be reduced to a very fine degree, and yet be in perfect regulation by turning the split pin 1).

The advantages of this improved transmitter are as'follows: First, it can be adjusted to any degree of pressure required with ease; second, this adjustment is positive and permanent; third, the attachment of the bar to the diaphragm and case in a rigid manner pro duces the most sensitive results in the electrode-contacts; fourth, the simplicity of the two electrodes and bar will permit a multiple number of points to be used in one transmitter, thus subdividing the current and rendering the most sensitive action.

. I prefer to combine with one instrument two diaphragms-to wit, the diaphragm D, already described, and a diaphragm, D. This latter diaphragm adapts the instrument to be used as a receiver, the diaphragm D being used when the instrument is employed as a transmitter. Two permanent magnets, B B, are employed, one opposite each diaphragm. The magnets B B are surrounded by helices G G, that constitute part of the wire for the magneto-current. This current travels as follows: Starting from a distant station, it runs over wire m to induction-coil K, to wire m, to helix G, to wire m to helix G, to wirem and thence to the ground, or to a farther station. The local battery-current runs from electrode E to wire a, to battery H, to wire 12, to induction-coil K, to wire a and to electrode E p The operation of the apparatus is as follows: The vibrations of diaphragm D are transmitted by bar L to the electrodes E E, these vibrations prod ucing corresponding variations of the battery-current. The variations of the battery-current produce corresponding variations in the strength of the magneto-current through the induction-coil K. The variations in the magneto-current produce vibrations of the diaphragm at the distant station, as is well known.

The operation of this transmitter is such that the sound-waves vibrate the diaphragm and the electrodes Vibrate in harmony therewith, and such electrode vibrations allow the variations in the current from battery and induction coil to affect the magnetic current in such manner as to increase the volume of each magnet impulse, conforming in tone and pitch to the sound-waves against the diaphragm, as

'is common in this class of transmitters;-but in this transmitter there is a different feature or improvement, resulting from the direct contact of the electrode-bar with thediaphragm itself,

which contact with the diaphragm continues mitter, of spring-arm A, and bar L, having shoulder-piece P, with springs s s", carrying electrodes E E and secured to such shoulderpiece, substantiallyas specified.

2. The combination, in a telephone-transmitter, of spring-arm Afand bar L, having extension L, and socket l, with springs s s, carryingelectrodes E E, and with insulators I w, and split pin 10, forholding and adjust-- ing spring 8, substantially as specified. 3o

3. The combination, in a telephone-trans- I mitter, of bar L, having shoulder-piece Z and extensions Z L, with diaphragm D, and bracket U, the extension Z being attached to diaphragm D, and the extensionL' being at- 35 tached to bracket L substantially as specified.

'4. The combination, in a telephone-tr ansmitter, of a diaphragm with a bar attached to said diaphragm, said bar having one extension projecting away from said diaphragm, pro-- vided with an adj usting-screw operating into a bracket secured to the case'or frame, and said bar having another extension about parallel with said diaphragm provided with a substantially as specified.

NOYES F. PALMER.

i/Vitnesses:

F. v. BRIESEN,

HENRY E. RoEDER. 

